For everyone having opinions about how many hours this person has spent playing RDR2, you should probably note that he's an RDR2 Youtube and Twitch content creator/streamer. So at face value, it has been his job for the last 2.5 years.
Yeah that blunts my immediate reaction of "This is blessing in disguise", that said I'm really hard pressed to understand how this person doing this for a job thought Google's streaming service would be the best choice.. at a certain point dedicated hardware is a very sensible business purchase.
Stadia had built-in support for streaming directly to Youtube. Very easy, completely integrated and heavily advertised.
Setting up your own hardware streaming build in 2019 was more difficult and expensive.
So this user "bought" (or accepted) a product from Google that promised to make everything easy for them and, until now, it was fulfilling that promise.
Then start a new game on a different system and speed run. If he is really good at the game he will likely get more views than resting on his laurels with whatever groove he has settled in to. That said having never heard of or watched him before and not knowing his schtick...